What is TWICE's J-line, Unnie line, Visual line, and Maknae line

MAKNAE LINE – What is TWICE?

Twice Members Flashcards

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How is the amount of members that make up the maknae line decided

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Unnie Line, Twice Wiki

What does maknae line and hyung line mean? - Quora

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What does J-line refer to in the K-pop group Twice? - Quora

Taking A Look At The Presence Of TWICE's J-Line - Koreaboo